Flue or duct.



PATENTED MAY 17, 1904.

No. 760,216. H. LAWS.

FLUE 0R DUCT. APPLICATION FILED DEC. 23. 1903.

2 SHEETS-SHBET 2.

N0 MODEL.

I N VE N TOR jidrr zz am A TTOHN E Y S WITNESSES.

Patented May 17, 1904.

PATENT OFFICE.

HARRY H. LAWS, OF NEW YORK, N. Y.

FLUE OR DUCT.

SPECIFICATION forming part of Letters Patent N0. 760,216, dated May 17,1904.

Application filed December 23, 1903. Berial No. 186,315. (No model.)

To all whom, it may concern:

Be it known that I, HARRY H. LAws, a citi- Zen of the United States, anda resident of the city of New York, borough of Brooklyn, in the countyof Kings and State of New York, have invented a new and Improved Flue orDuct, of

which the following is a full, clear, and exact at the joint.

' A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a sectional side elevation of an upright duct or flue, thesection being on the line 1 1 of Fig. 4:. Fig. 2 is a transverse sectionof the same on the line2 20f Fig. I. Fig. 3 is a perspective view of oneof the sections; Fig. 4: is a sectional plan view of the improvement.Fig. 5 is a perspective view of one of the locking-keys for thesections, and Fig. 6 is a similar view of another locking-key.

The rectangular sections A and B of the fine or duct are approximatelyof the same size, as plainly indicated in the drawings, and the sectionA is provided on its four sides with outwardly extending return bendflanges A, while the section B is provided on three of its sides withoutwardly-extending return-bend flanges B, and the fourth side, B isleft plain, as plainly illustrated in Fig. 3. The adjacent sets offlanges A and B of the sections A and B are adapted to be fastenedtogether by keys 7 (3, while the plain side B of the section B isfastened to the corresponding flange A of the other section, A, by a keyD. (Illustrated in Fig. 6 and to the right in Fig. 2.)

Each of the keys C, of which three are'employed for the flue shown. isformed with inwardly-extending hooks C C connected with each other at.the outer members of the hooks by a doubled-up rib C, it beingunderstood that when the sections A and B are placed in abuttingposition then the keys U are slipped sidewise in engagement with thecorresponding flanges A and B to fasten the said flanges together, asplainly illustrated in Fig. 1 and to the left in Fig. 2. The fourth key,I), is provided at one side with an inwardly-extending hook D and at theopposite side with an out- Wardly-opening hook D having its top memberconnected by a flange D with one side of a doubled-up rib D, connectedat its other side with the top member of the hook D, as will be readilyunderstood by reference to Fig. 6. Now the plain side B readily entersthe outwardly-opening hook D while the hook D engages the correspondingflange A, located opposite the plain side B In practice the key D isfirst connected by its hook I) with the corresponding flange A of thesection A, and then the section B is placed in abutting positionrelative to the section A, so that the plain side B passes into theoutwardly-opening hook D*. After this has been done the other keys, (J,are placed in position, as above described, it being understood that thehooks O C D D are approxi mately of a length corresponding to the sidesof the sections on which they are used, while the doubled-up ribs 0 andD* are extended beyond the flanges to form corner-joints. as plainlyindicated in Fig. 1. If desired, however, the projecting ends of thedoubled-up ribs CD may be cut or mitered, so as to abut each other,instead of one passing into the other, as indicated in Fig. 4.

From the foregoing it will be seen that the flue or duct sections Aand Bcan be securely fastened together on all sides, and by the use of thekeys 0 and D, as described, exceedingly strong joints are produced,reinforced by the doubled-up ribs C and D. It will also be seen that bythe construction above set forth,

and illustrated in the drawings, the inner surfaces of the sides of thesections are rendered practically continuous, so as to present noobstructions whatever to the ready passage of the fluid passing throughthe duct or flue, thus reducing the resistance to the fluid passingthrough the flue or duct to a minimum.

By the arrangement above described it will be seen that the severalsections of the flue or duct can be readily fastened together, and byhaving one side, B of a section plain and a key D arranged as describedit is evident that the sections can be readily fastened together,especially when the flue or duct is located in a corner of a room andtwo sides thereof are not easily accessible, owing to the wall of theroom.

Having thusdescribed my invention, I claim as new and desire to secureby Letters Patent 1. A metal flue made in sections, each of the sectionshaving its sides provided with returnbend flanges and keys, each foruniting the flanges of adjacent sides of the sections with each other,each key having interlocking hooks extending in direction of each otherfor engaging the adjacent section-flanges and a doubled-uprearwardly-extending rib connecting the inner sides of the hooks of akey integrally and yieldingly with each other, as set forth.

2. A metal flue made in sections, one of the sections having each sideprovided with a return-bend flange and the other section having itssides, except one, provided with like return-bend flanges, keys forengaging the adjacent flanges of three sides of the sections, and a keyengaging the remaining flange of one section and provided with a recessfor receiving the plain end of the other section, as set forth.

3. A metal flue made in sections, one of the sections having each sideprovided with a return-bend flange and the other section having itssides, except one, provided with like return-bend flanges, keys forengaging the adjacent flanges of three sides of the sections, each keyhaving hooks and a doubled-up rib connecting the hooks with each other,and a key engaging the remaining flange of one section and having arecess for receiving the plain end of the other section, as set forth.

4. A metal flue made in sections, one of the sections having each sideprovided with a return-bend flange and the other section having itssides, except one, provided with like return-bend flanges, keys forengaging the adjacent flanges of three sides of the sections, each keyhaving hooks and a doubled-up rib connecting-the hooks with each other,and a key engaging the remaining flange of one section and having arecess for receiving the plain end of the other section, the key havingan inwardly-opening hook at one side and an outwardly-opening hook atthe other side and a doubled-up rib connecting the hooks with eachother.

5. A key for locking the sections of a flue or duct with each other,consisting of hooks extending inwardly in direction of each other, and adoubled-up rib extending rearwardly substantially at a right angle tosaid hooks and integrally connecting the inner sides of said hooks witheach other.

6. A key for locking the sections of a flue or duct with each other,consisting of an inwardly-extending hook at one side, anoutwardly-opening hook at the other side, and a doubled-up rib andflange for connecting the said hooks with each other, as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

, HARRY H. LAWS. Witnesses:

THEO. G. HOSTER, E. C. NIELSON.

